3 files changed, 52 insertions, 37 deletions

diff --git a/backend/drm/backend.c b/backend/drm/backend.c
index 81a212d2..e5614ae2 100644
--- a/backend/drm/backend.c
+++ b/backend/drm/backend.c
@@ -40,36 +40,24 @@ static struct wlr_backend_impl backend_impl = {
 	.destroy = wlr_drm_backend_destroy
 };
 
-static void device_paused(struct wl_listener *listener, void *data) {
-	struct wlr_backend_state *drm = wl_container_of(listener, drm, device_paused);
-	struct device_arg *arg = data;
-
-	// TODO: Actually pause the renderer or something.
-	// We currently just expect it to fail its next pageflip.
-
-	if (arg->dev == drm->dev) {
+static void session_signal(struct wl_listener *listener, void *data) {
+	struct wlr_backend_state *drm = wl_container_of(listener, drm, session_signal);
+	struct wlr_session *session = data;
+
+	if (session->active) {
+		wlr_log(L_INFO, "DRM fd resumed");
+
+		for (size_t i = 0; i < drm->outputs->length; ++i) {
+			struct wlr_output_state *output = drm->outputs->items[i];
+			wlr_drm_output_start_renderer(output);
+		}
+	} else {
 		wlr_log(L_INFO, "DRM fd paused");
-	}
-}
-
-static void device_resumed(struct wl_listener *listener, void *data) {
-	struct wlr_backend_state *drm = wl_container_of(listener, drm, device_resumed);
-	struct device_arg *arg = data;
-
-	if (arg->dev != drm->dev) {
-		return;
-	}
 
-	if (dup2(arg->fd, drm->fd) < 0) {
-		wlr_log(L_ERROR, "dup2 failed: %s", strerror(errno));
-		return;
-	}
-
-	wlr_log(L_INFO, "DRM fd resumed");
-
-	for (size_t i = 0; i < drm->outputs->length; ++i) {
-		struct wlr_output_state *output = drm->outputs->items[i];
-		wlr_drm_output_start_renderer(output);
+		for (size_t i = 0; i < drm->outputs->length; ++i) {
+			struct wlr_output_state *output = drm->outputs->items[i];
+			wlr_drm_output_pause_renderer(output);
+		}
 	}
 }
 
@@ -139,14 +127,8 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 		goto error_fd;
 	}
 
-	wl_list_init(&state->device_paused.link);
-	wl_list_init(&state->device_paused.link);
-
-	state->device_paused.notify = device_paused;
-	state->device_resumed.notify = device_resumed;
-
-	wl_signal_add(&session->device_paused, &state->device_paused);
-	wl_signal_add(&session->device_resumed, &state->device_resumed);
+	state->session_signal.notify = session_signal;
+	wl_signal_add(&session->session_signal, &state->session_signal);
 
 	// TODO: what is the difference between the per-output renderer and this
 	// one?
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 5afdf3c3..ca4f56c3 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -116,6 +116,21 @@ static void wlr_drm_output_end(struct wlr_output_state *output) {
 	output->bo[0] = bo;
 }
 
+void wlr_drm_output_pause_renderer(struct wlr_output_state *output) {
+	if (output->state != DRM_OUTPUT_CONNECTED) {
+		return;
+	}
+
+	if (output->bo[1]) {
+		gbm_surface_release_buffer(output->gbm, output->bo[1]);
+		output->bo[1] = NULL;
+	}
+	if (output->bo[0]) {
+		gbm_surface_release_buffer(output->gbm, output->bo[0]);
+		output->bo[0] = NULL;
+	}
+}
+
 void wlr_drm_output_start_renderer(struct wlr_output_state *output) {
 	if (output->state != DRM_OUTPUT_CONNECTED) {
 		return;
@@ -608,7 +623,7 @@ static void page_flip_handler(int fd, unsigned seq,
 	}
 
 	output->pageflip_pending = false;
-	if (output->state == DRM_OUTPUT_CONNECTED) {
+	if (output->state == DRM_OUTPUT_CONNECTED && state->session->active) {
 		wlr_drm_output_begin(output);
 		wl_signal_emit(&output->wlr_output->events.frame, output->wlr_output);
 		wlr_drm_output_end(output);
diff --git a/backend/libinput/backend.c b/backend/libinput/backend.c
index 82ba44a6..fedab148 100644
--- a/backend/libinput/backend.c
+++ b/backend/libinput/backend.c
@@ -86,6 +86,21 @@ static struct wlr_backend_impl backend_impl = {
 	.destroy = wlr_libinput_backend_destroy
 };
 
+static void session_signal(struct wl_listener *listener, void *data) {
+	struct wlr_backend_state *backend = wl_container_of(listener, backend, session_signal);
+	struct wlr_session *session = data;
+
+	if (!backend->libinput) {
+		return;
+	}
+
+	if (session->active) {
+		libinput_resume(backend->libinput);
+	} else {
+		libinput_suspend(backend->libinput);
+	}
+}
+
 struct wlr_backend *wlr_libinput_backend_create(struct wl_display *display,
 		struct wlr_session *session, struct wlr_udev *udev) {
 	assert(display && session && udev);
@@ -112,6 +127,9 @@ struct wlr_backend *wlr_libinput_backend_create(struct wl_display *display,
 	state->udev = udev;
 	state->display = display;
 
+	state->session_signal.notify = session_signal;
+	wl_signal_add(&session->session_signal, &state->session_signal);
+
 	return backend;
 error_state:
 	free(state);